#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;

int main(){
    int n, min1 = 1000000, p = 0;
    cin >> n;
    vector<int> v(n);
    for (int i = 0; i < n; i++) cin >> v[i];
    sort(v.begin(), v.end());
    for (int i = 0; i < n - 1; i++){
        if(v[i] != v[i+1]){
            min1 = min(min1, abs(v[i+1] -v[i]));
        }
    }
    cout << ((min1 == 1000000) ? 0 : min1) << endl;
}